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Photo voltaic Battery Backup (A house owner’s information)  

Are persistent energy outages getting you down? Then it’s time that you simply put money into a photo voltaic battery backup system.

Annually, thousands and thousands of electrical energy prospects throughout the U.S. expertise energy failures. In 2020, the typical length per family was 8 hours.

However, that is solely the tip of the iceberg. States equivalent to Louisiana, Texas, and California are susceptible to main electrical failures (as much as 60 hours) as a result of excessive climatic occasions and weak energy grid resilience.

These outages have devastating results on each home life and native economies.

Luckily, there’s a resolution to deal with these recurrent energy failures — photo voltaic battery backup programs.

In our house owner’s information, you’ll learn the way these programs function, what they price, and the kind of system you’ll require to get you thru any energy outage that comes your approach.


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What Is A Photo voltaic Battery Backup System?

A Photo voltaic battery backup system can be known as a photo voltaic UPS (Uninterrupted Energy Provide). In different phrases, it’s designed to produce electrical energy seamlessly to your home home equipment throughout an influence failure. 

Moreover, this backup system generates electrical energy from the solar always — you’ll be able to then use this additional energy in your own home or promote it to your native utility firm.

A fundamental photo voltaic battery backup system contains three primary parts put in:

  • Photo voltaic panels
  • Hybrid inverter
  • Photo voltaic battery

How Does A Photo voltaic Battery Backup Work?

A photo voltaic battery backup system’s primary parts carry out 3 main features:

  • Photo voltaic panel array: manufacturing
  • Photo voltaic inverter: provide
  • Photo voltaic battery: storage

Let’s take a look at every element and see how they work together.

Photo voltaic Panel Array: Manufacturing

Photo voltaic panels use daylight to generate electrical energy within the type of DC (direct present). Organizing these photo voltaic modules in an array of a number of or extra items helps them attain a better energy output.

Photo voltaic Inverter: Provide

The inverter is the “mind” of your photo voltaic backup system. 

On this case, you’ll want a hybrid or off-grid inverter. This inverter regulates your battery’s cost (DC) with photo voltaic power and provides energy to your own home or utility firm. Moreover, it mechanically detects an influence outage and switches to the housing provide within the blink of a watch.

Photo voltaic inverters are programmable; you’ll be able to monitor and management them through a cell phone app.

Photo voltaic Battery: Storage

A photo voltaic battery is crucial to your photo voltaic battery backup system. It ensures a easy and steady energy provide in case of an influence outage.

Photo voltaic Battery Backup System Diagram

Let’s check out how the three major parts of a photo voltaic battery backup work together with one another.

As seen beneath, DC electrical energy is produced by the photo voltaic panels and saved within the battery through an inverter.

A solar battery backup system.
A photo voltaic battery backup system.

Thereafter, the hybrid inverter has two choices:

Inverters are versatile gadgets; you too can instruct them to instantly provide photo voltaic power on to your own home even when there isn’t an influence outage.

Who Ought to Get Photo voltaic Battery Backup?

Any house owner trying to make use of their home equipment in a stress-free method throughout an influence failure ought to put money into a photo voltaic battery backup system.

Not solely will these backup programs defend your home equipment within the occasion of grid failure, however they will additionally enable you cut back your month-to-month electrical energy invoice by permitting you to provide your individual electrical energy.

As a bonus, photo voltaic battery backups are nearly maintenance-free and function seamlessly — simply another reason so that you can get a backup system!

What Dimension Photo voltaic Battery Backup Do You Want?

You might have two choices when designing your photo voltaic battery backup system: 

  • A whole backup of your property electrical system
  • A partial backup of your important home equipment

Clearly, the extra home equipment you must energy, the bigger your system shall be.

In each instances, the purpose is to energy your home equipment for at the very least 24 hours straight; this can get you thru 99% of all energy outages.

The next are examples of a whole and partial backup system:

Dimension Of A Whole Backup System

To appropriately dimension your photo voltaic battery backup system, you’ll must know your day by day electrical energy consumption — take a look at your electrical energy invoice, your power consumption is indicated in kWh.

Let’s take into account the typical U.S. family’s day by day electrical energy consumption of 30 kWh.

As beforehand talked about, a photo voltaic battery backup system consists of three major elements (photo voltaic panel, hybrid inverter, and photo voltaic battery). Every should be sized in line with demand.

Photo voltaic Battery Dimension

Crucial a part of the system is the photo voltaic battery. To have a enough backup, particularly in areas susceptible to lengthy energy interruptions, we suggest a storage capability equal to a full day of electrical energy use. On this case: 30 kWh of battery storage.

Photo voltaic Panel Dimension

Dimension your photo voltaic panel array to provide sufficient electrical energy to cowl someday of use. 

Let’s say you reside in California. To supply a median of 30 kWh per day, you’ll want a 6 kW photo voltaic panel array, equal to 12 x 500W photo voltaic panels.

Hybrid Inverter Dimension

The inverter provides electrical energy to your own home. It must be highly effective sufficient to run a number of home equipment concurrently. We suggest a 7kW capability. 

Right here is the scale of your gear for a whole backup system:

Photo voltaic Panel ArrayPhoto voltaic BatteryHybrid Inverter

Dimension Of A Partial Backup System

Having a whole backup system could be very pricey. Luckily, it’s attainable to energy solely your important home equipment with a smaller system.

Listed here are some fundamental home equipment:

Home equipmentEnergy (Watt)Hours Of Use Per DayElectrical energy Consumption (kWh)
Lights (10pcs)70100.7
Aircon (18’000 BTU)1440All day5.8
Fridge/freezer (28 cubic)190All day2.02
Laptop computer/USB charging15040.6
Stovetop (induction)180011.8

The full day by day consumption for these important home equipment is 11.5 kWh.

This interprets into the next photo voltaic battery backup system:

Photo voltaic Panel ArrayPhoto voltaic BatteryInverter

Notice to our readers: please don’t neglect to regulate the scale of your photo voltaic panel array relative to your location.

Consider your native photo voltaic electrical energy manufacturing on Photo voltaic World Atlas.

How A lot Does A Photo voltaic Battery Backup System Price?

A whole photo voltaic battery backup system on your house will price you round $40,000, with an LCOE of $0.26/kWh.

In distinction, a partial backup of your important home equipment will set you again roughly $15,500, with an LCOE of $0.277/kWh.

The next is a value breakdown of every system:

Full House Backup System

Energy/CapabilityPrice Inc. Set up And Tax Credit score (26%)LCOE (USD/kWh)
Photo voltaic panel array6kW12,000 USD0.037
Photo voltaic battery30kWh23,100 USD0.21
Hybrid Inverter7kW5,000 USD0.018
TOTAL 40,000 USD0.26

Important Home equipment Backup System

Energy/CapabilityPrice Inc. set up And Tax Credit score (26%)LCOE (USD/kWh)
Photo voltaic panel array2.3kW4,600 USD0.037
Photo voltaic battery13.5kWh7,700 USD0.21
Hybrid Inverter4kW3,200 USD0.03
TOTAL 15,500 USD0.277

You could suppose the shopping for worth is excessive, and also you’re right! However this isn’t the precise price of your backup system.

Bear in mind, your photo voltaic battery backup system produces electrical energy day by day; you need to use it at house or promote it to the grid.

The most applicable metric to guage the price of a photo voltaic backup system is the LCOE (Levelized Price Of Power).

LCOE is expressed in USD/kWh and considers all bills throughout your system’s lifespan (as much as 30 years).

Ultimately, the precise price of your system is round $0.26/kWh.

That is nonetheless larger than the typical US electrical energy price: $0.147/kWh (April 2022), however already decrease or equal to the electrical energy price in 6 US states. Moreover, it’s necessary to keep in mind that your LCOE is mounted for the subsequent 25 to 30 years, whereas electrical energy costs enhance 3 to five% yearly. 

How Lengthy Will Photo voltaic Battery Backup Final In A Energy Outage? 

A well-designed photo voltaic battery backup system will final at the very least 24 hours throughout an influence outage. This may be prolonged to a number of days if it’s sunny sufficient to completely cost the photo voltaic battery.

The first reason for energy failures is excessive climatic occasions equivalent to hurricanes or heavy snowfall. As of July 2022, the biggest occasion affected 250,000 prospects in Tennessee for 106 hours (February 2022).

Any family geared up with a enough photo voltaic battery backup system would make it via this interruption seamlessly.

Closing Ideas

Energy outages are huge disturbances to our day by day lives. In some conditions, when medical gear is required, it will possibly even be life-threatening.

Fortunately, energy backup options on your house exist.

For years, the one possibility was a gasoline generator, a pricey and hard-to-maintain piece of kit.

Now, you may make it via any energy outage stress-free with a photo voltaic battery backup system

This technique offers you with a minimal of 24 hours of backup (as much as one week or extra).

This backup system is dependable, maintenance-free, doesn’t produce smoke or noise, final lengthy (as much as 30 years), and even produces electrical energy every day.

We found {that a} full backup system on your house would price round $40,000USD with an electrical energy price (LCOE) of $0.26/kWh.

For decrease budgets, a partial backup of your important equipment will do an important job for under $15,500with an precise electrical energy price of $0.277/kWh.

Don’t look ahead to the subsequent shutdown; get on the market and seize your self a photo voltaic battery backup system now!


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